In chemistry, an oxycation is a polyatomic ion with a positive charge that contains oxygen.

Examples

• Dioxygenyl ion, O⁺
  ₂
• Nitrosonium ion,NO⁺
  
• Nitronium ion, NO⁺
  ₂
• Vanadyl ion, VO²⁺, a very stable oxycation
• Uranyl ion, UO²⁺
  ₂, all natural U⁶⁺ occurs in this form
• Zirconyl ion, as a tetramer of [Zr(OH)₂]²⁺

See category for a bigger list.